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Analysing the impact of anisotropy pressure on tokamak equilibria

Qu, Zhisong; Fitzgerald, Michael; Hole, Matthew

Description

Neutral beam injection and ion cyclotron resonance heating induce pressure anisotropy. The axisymmetric plasma equilibrium code HELENA has been upgraded to include anisotropy and toroidal flow. We have studied, using both analytical and numerical methods, the determining factors for anisotropic equilibria and their impact on flux surfaces, the magnetic axis shift, and the displacement of pressure and density contours from the flux surface. With p∥/ p⊥≈ 1.5, p⊥ can vary by 20% on the s=0.5 flux...[Show more]

dc.contributor.authorQu, Zhisong
dc.contributor.authorFitzgerald, Michael
dc.contributor.authorHole, Matthew
dc.date.accessioned2015-12-08T22:39:09Z
dc.identifier.issn0741-3335
dc.identifier.urihttp://hdl.handle.net/1885/36117
dc.description.abstractNeutral beam injection and ion cyclotron resonance heating induce pressure anisotropy. The axisymmetric plasma equilibrium code HELENA has been upgraded to include anisotropy and toroidal flow. We have studied, using both analytical and numerical methods, the determining factors for anisotropic equilibria and their impact on flux surfaces, the magnetic axis shift, and the displacement of pressure and density contours from the flux surface. With p∥/ p⊥≈ 1.5, p⊥ can vary by 20% on the s=0.5 flux surface, in a MAST-like (MAST: Mega Amp Spherical Tokamak) equilibrium. We have also re-evaluated the widely applied approximation to the anisotropy in which p*= (p∥+p⊥)/2, the average of the parallel and perpendicular pressures, is taken as the approximate isotropic pressure. We show that an isotropic reconstruction can yield a correct p* only by giving an incorrect RBφ. We find the reconstructions of the same MAST discharge with p∥/p⊥≈1.25 using isotropic and anisotropic models to have a 3% difference in a toroidal field and a 66% difference for a poloidal current.
dc.publisherInstitute of Physics Publishing
dc.sourcePlasma Physics and Controlled Fusion
dc.titleAnalysing the impact of anisotropy pressure on tokamak equilibria
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume56
dc.date.issued2014
local.identifier.absfor020204 - Plasma Physics; Fusion Plasmas; Electrical Discharges
local.identifier.ariespublicationu4860843xPUB132
local.type.statusAccepted Version
local.contributor.affiliationQu, Zhisong, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationFitzgerald, Michael, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationHole, Matthew, College of Physical and Mathematical Sciences, ANU
dc.relationhttp://purl.org/au-research/grants/arc/DP140100790
dc.relationhttp://purl.org/au-research/grants/arc/DP1093797
local.bibliographicCitation.issue7
local.bibliographicCitation.startpage1
local.bibliographicCitation.lastpage10
local.identifier.doi10.1088/0741-3335/56/7/075007
local.identifier.absseo970102 - Expanding Knowledge in the Physical Sciences
dc.date.updated2015-12-08T10:14:13Z
local.identifier.scopusID2-s2.0-84902959749
local.identifier.thomsonID000338515300008
dcterms.accessRightsOpen Access
dc.provenancehttp://www.sherpa.ac.uk/romeo/issn/0741-3335/..."Post-print on institutional website, institutional repository, subject-based repository, PubMed Central, non-commercial scientific social network or third party eprint servers after 12 months embargo" from SHERPA/RoMEO site (as at 6/02/19).
CollectionsANU Research Publications

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